Manufacture of strap sandals



Oct. 13, 1936. ,D. J. SULLIVAN I 2,057,072

MANUFACTURE OF STRAP SANDALS Filed Nov. 5, 1934 2 Sheets-Sheet l Oct. 13, 1936. I D, J sULLlVAN 2,057,072

MANUFACTURE OF STRAP SANDALS Filed Nov. 5, 1934 2 Sheets-Sheet 2' w I WM Patented Oct. 13, 1936 UNITED STATES 2,057,012 MANUFACTURE OF STRAP SANDALS Dennis J. Sullivan,

Lynn, Mass., assignor to United Shoe Machinery Corporation, Paterson, N. J.,' a corporation of New Jersey Application November 5, 1934, Serial No. 151,488 4 Claims. (01.. 12-142) This invention relates to improvements in the manufacture of strap sandals and other shoes of the type .wherein the shoe is adapted to be re-' tained in place upon the foot by means of straps or the like which extend upwardly from the .lat-

eral edge portions of the sole.

In making strap sandals it is a common practice to assemble the upper, i. e., the straps, together with an insole, on a last, to tension the straps over the last and temporarily secure their end portions in overlasted relation to the insole by means of upstanding lasting tacks driven through the straps and the insole and into the last, subsequently to secure the straps to the insole by means of fastenings which are driven while the sole is on the last and are allowed to remain permanently in the shoe, and finally to withdraw the temporary lasting tacks.

The present invention provides an improved and-simplified method of making strap sandals 'which comprises Working the straps or the strap,-

like members of an upper one at a time into conforming relation to a last andoverlying relation to an insole on the last and, as each strap is worked into place, driving a fastening through the end portion of that strap and through the insole and clenching the fastening against the inper surface of the insole thereby permanently securing the strap in place and thereby rendering 30 unnecessary the initial insertion and subsequent withdrawal of temporary fastenings. As illustrated, the ends of the straps are received in marginal slots or recesses in the outer surface of the insole and are secured by the permanent fasten- 5 ings in countersunk relation to the insole so that the outer surfaces of the straps will be substantially flush with the outer surface of the insole and consequently will have no tendency to produce objectionable ridges in the outsole. As here- 40 in exemplified also, wire staples are employed as the permanent 'fastenings and the points of the staples are clenched against the inner side of the insole by means of a thin, blade-like anvil which is inserted between the insole and the last in the 45 various locations where the staples are to be,

driven.

The invention will be explained with reference to the accompanying drawings, in which Fig. 1 is a perspective view of a last supported 50 bottom uppermost and having an insole secured in place thereon;

Fig. 2 is a perspective view of the last rightside up as it appears after a strap upper has been assembled therewith and temporarily secured in 55 place thereon;

' Fig. 3 is a cross-sectional view of a portion of the last with the insole and upper assembled therewith, illustrating the manner in which each strap is worked into conforming relation with the last; 5 Fig. 4 is a fragmentary plan view of the last with the insole and upper thereon, illustrating particularly the manner in which the anvil is positioned for the purpose of clenching the points of the permanent staple fastenings; 10

Fig. 5 is a View, partially in elevation and partially in cross-section, on the line VV of Fig. 4,

of the parts shown in Fig. 4, showing in addition the staple driving instrumentalities;

Fig. 6 is a detailed fragmentary sectional view 15 taken on the line VI-VI of Fig. 5; and

Fig. 7 is a fragmentary sectional view taken along the lines VII-VII of Fig. 4 and illustrating particularly the operation of trimming the ends of the straps.

My improved .method is exemplified in the drawings with reference to the manufacture of a shoe comprising an insole l0 and an upper l2 comprising a plurality of straps M, the insole being provided with a plurality of marginal notches or recesses Iii for receiving the end portions of the straps. As shown, the insole ID is of laminated construction comprisingan inner layer or ply l8 and an outer layer 20 and the edges of the two layers are covered by a binding strip 22 having portions which overlie the inner and outer margins of the insole and are secured to the insole by stitches. As shown, the notches l6 are formed by cutting slots in the outer layer 20 of the insole, which is of substantially the same thickness as the straps, so that the straps will be received in the notches [6 with the outer faces of the straps substantially flush with the outer face of the insole so that a smooth surface will be presented for the reception of the outsole of the shoe.

In carrying out my improved method, as herein exemplified, the insole l0 and the upper 12 are assembled on a last 24, the insole being secured in place by means of tacks 26 and the upper being 5 secured to the last by means of tacks 28. The straps M are then worked one at a time into conforming relation to the last and overlying .relation to the insole, for example, by means of v the operator's fingers, as indicated in Fig. 3, the

straps being positioned so that the portions which overlie the insole will be received within the notches l6. Advantageously, although not necessarily, this working of the strap-ends into conforming relation to the last and overlying relasuch acharacter and is so applied that it can be allowed to remain as a permanent fastening. As herein shown wire staples 30 are employed for the permanent fastenings, the staples, in the illus trated exemplification of my improved method,.

being driven by means of a staple fastener inserting machine which is indicated at 32 and which may be of the type of the machine disclosed in United States Letters Patent No. 1,599,704, granted September 14,1926, upon application of T. J. Finn. As illustrated, the staples are driven inwardly through the straps and through theunderlying inner layer is of the insole i0 and the ends or points of the staples are clenched against the inner surface of the layer is by means of a thin and narrow, blade-like anvil 34 which may advantageously be adjustably aiilxed to the frame of the staple inserting machine. The anvil 34 is sufliciently thin to enable it to be readily inserted between the insole and the bottom of the last without effecting any substantial amount of upward displacement of the insole and,' as best shown in Fig. 4, is sufllciently narrow so that it may be readily inserted at the location where the staple is to be driven without having any tendency to displace the strap from the position in which it has been placed.

After one of the straps is has been tensioned over the last and its end portion has been received within the respective notch ii in the insole and permanently secured in place by means of a staple 30 or other suitable fastening, similar operations are performed upon the next adjacent strap, these operations being continued until all 'of the straps have been progressively tensioned and permanently secured to the insole in the desired relation. The portions of the'straps which extend into the notches I6 are disposed and held by the staples 30 with their outer surfaces substantially flush with the-outer surface of them- 'sole layer 20 but the extreme end portions of the straps which extend inwardly beyond the notches i8 project above the surface of the insole and these projecting end portions are finally trimmed off, for example, by means of a manually operated trimming knife (the blade of which is shown at ll in Fig. 7) in such a manner that the trimmed edges of the straps will be left flush with the surface of the insole. The shoe is now to have its outsole applied and the latter mayl be conveniently secured to the insole and to the po tions of the straps which are countersunk wi the notches II by means of cement or My improved method renders unnecessary the initial insertion and subsequent withdrawal of tacks or other temporary fastening devices for holding the straps in'overlasted relation to. the insole. Inasmuch as no fastenings are driven into the last there is no resulting wear upon the last.

The use of an anvil, such as the anvil N, for clenching the points of the permanent fastenings renders unnecessary the provision of any metallic insertsorthelikeuponthebottomoftho last.

' strap sandals which consists in assembling-an 1nsole and an upper comprising a plurality of straps on a last, lasting the straps one at a time in overlying relation to the insole, and permanently securing each strap-to the insole immediately after it has been lasted and before the succeeding strap-lasting operation has been performed by driving fastenings through the straps and through the insole and clenching the fastenings against the inner surface of the-insole.

2. That improvement in methods of making strap sandals which consists in assembling with a last an insole having recesses in the lateral marginal portions of its outer face for receiving the ends of straps, working a plurality of straps one at a time into conforming relation to the last and into overlasted position on the insole with the end portions of the straps located within the recesses in the insole and as the end portion of each strap is received within'its respective recess inserting a clenching anvil between the in sole and the last bottom in a location directly be- Y neath said recess, driving a staple through the the anvil thereby permanently securing the strap in place within its recess in the-insole.

3. That improvement in methods of making strap sandals which consists in assembling an insole and an upper comprising a plurality of straps on a last, progressively working'the straps into conforming relation to the last with the end portions of each strap overlying the insole and, immediately 'after each strap has been worked into place, introducing a fastener-clenchinganvil between the insole and the bottom of the last in a location directly beneath the end portion of the strap, driving a fastening through the strap and insole, and clenching one end of the fastening against the insole by means of the anvil thereby permanently securing the strap to the insole.

4. That improvement inmethods of making strap sandals which consists in assembling on a last an upper. comprising a plurality of straps and an insole having recesses in the lateral marginal portions of its outer face for receiving the end portions of said straps, working the straps one at a time into conforming relation to the last and overlying relation to the insole with a porthrough the underlying portion of the insole and clenching the ends of the staple against the insole by, means of the anvil thereby permanently attachingthe strap to the insole, andflnally off the projecting extremities of the straps so as to leave their trimmed with the outer surface of the insole.

nsums J. sULuvAN.

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